code: def labels(savefile="labels_test.png"):
      drawer = MPLDrawer(n_wires=2, n_layers=1)
      drawer.label(["a", "b"])
      plt.savefig(folder / savefile)
      plt.close()
  
file_path: pennylane/doc/_static/drawer/mpldrawer_examples.py
imports: import pathlib
  import matplotlib.pyplot
  from pennylane.drawer import MPLDrawer
  from pennylane.drawer.style import _set_style
label_desc: Use image node_id 1 for calling a global function with example usage: labels(savefile) without return types